The Vespiary

The Hive => Chemicals & Equipment => Topic started by: penner on May 27, 2003, 02:11:00 PM

Title: gbl extraction?
Post by: penner on May 27, 2003, 02:11:00 PM

there is a liquid which contains gbl, Methylpyrrolidon, and Dimethylester. i think the Dimethylester is a substace which is in german called "Maleinsäuredimethylester"

i want to know more about these substaces and how to extract the glb from this liquid?

Title: Separation of GBL and NMP
Post by: Rhodium on May 27, 2003, 07:34:00 PM

Separation of GBL and NMP (N-methylpyrrolidinone) has been discussed before, plug in a few of these synonyms in TFSE and see for yourself.

Title: and whats about the Dimethylester?
Post by: penner on May 28, 2003, 03:46:00 AM

and whats about the Dimethylester?

Title: Maleic acid dimethyl ester maybe?
Post by: cublium on May 28, 2003, 06:47:00 AM

Maleic acid dimethyl ester maybe?

Title: NMP/GBL/dimethylmaleate separation
Post by: Rhodium on May 29, 2003, 11:37:00 PM

The same thing holds true for NMP as for dimethylmaleate - after complete hydrolysis to the free acids, only the GHB re-esterifies with ease in a slightly acid aqueous solution, forming GBL (which can then be steam distilled off), while the amino-acid from NMP and the maleic acid stays in their acid form and will be pretty non-volatile.

Title: wrong forum
Post by: evoh_1 on May 29, 2003, 11:39:00 PM

this should be in another forum

Title: misinforming?
Post by: Rhodium on May 29, 2003, 11:49:00 PM

Oh, would you care to tell the audience which forum the extraction of GBL from a cleaning mixture should be placed, if not in

Chemicals & Equipment - Construction of lab equipment, sourcing and extraction of chemicals

Title: esterification
Post by: armageddon on August 08, 2004, 01:16:00 PM

Title: sorry - but you asked for it!
Post by: armageddon on August 09, 2004, 02:44:00 PM

You specifically asked for the reason why some bee thought the discussed topic belonged elsewhere - and I thought since nobody replied during the last few months, I would be allowed to post my opinion about the subject... :(

In case it was irony; why didn't you use a smiley then? (

Post 462395 (https://www.thevespiary.org/talk/index.php?topic=5619.msg46239500#msg46239500)

(Rhodium: "The last part is incorrect.", Chemicals & Equipment)


Anyway: if you think a thread is too old to take up any more useful information - why don't you just close it??

A (at the risk of getting bad karma again  :) )